add py3.12 to testing matrix

[cclauss]

ERROR: Could not find a version that satisfies the requirement torch>=1.1.0 (from versions: none)

https://pypi.org/project/torch

[jeshraghian]

The 3.12 test is failing, I think it's because 3.12 is missing from tox.ini under [tox] and [gh-actions].

[cclauss]

Travis CI - Pull Request Expected — Waiting for status to be reported Required should probably be removed from the required tests below unless there is an active, paid subscription to Travis CI which is no longer free to open source projects.

[cclauss]

I think that adding py312 to tox.ini will not solve the problem which looks like this:

py: install_deps> python -I -m pip install -r /home/runner/work/snntorch/snntorch/requirements_dev.txt
    [ ... ]
        File "/tmp/pip-build-env-vfl9zw5b/overlay/lib/python3.12/site-packages/setuptools/build_meta.py", line 311, in run_setup
          exec(code, locals())
        File "<string>", line 20, in <module>
      ModuleNotFoundError: No module named 'imp'

https://docs.python.org/3.12/whatsnew/3.12.html#imp so setuptools in requirements_dev.txt needs to be upgraded.

[cclauss]

      if: matrix.python-version == '3.12'
      run: pip install --upgrade setuptools

[jeshraghian]

It looks like we're still running into the same error above.

[cclauss]

Please re-approve te workflow so we can see if it passes.

[cclauss]

https://pypi.org/project/torch is not yet compatible with the current version of Python

[jeshraghian]

We can open this back up once PyTorch catches up to Python 3.12.